I think I now hve three options - M4, Default Rifle, and Bushmaster ACR.
I actually agree with you on the default rifle. My favorite thing about it is the fact that I can have 10+ completely different looking gun skins (correct me if I'm wrong) by buying just this one.
Right now though, I think M4 would be my safest bet, since it's basically a very balanced gun.
Finally, the Bushmaster ACR, a guy told me it's good at pk and spar, (I'm not sure if he's correct) which are my favorites. I honestly have never sparred in my whole time in graal but I think I've done it in the streets and I like the idea of it.
Even if I have three options, at least I know that I won't regret picking one of them. Thank you for clearing this up for me.